Nausea and vomiting are not necessarily caused by the new coronavirus infection, because this is only a clinical symptom, but can also be caused by other diseases, including gastrointestinal colds, diseases of the digestive system, etc., as follows: a. Gastrointestinal colds: The more common ones are gastrointestinal colds, which are caused by a decrease in the immunity of the body, and are infected by viruses, bacteria, mycoplasma, chlamydia and other pathogens, resulting in an inflammatory response in the upper respiratory tract The mucous membrane has an inflammatory reaction, and through the lymphatic system inflammation can spread to the digestive system, causing an inflammatory reaction in the digestive tract, which leads to symptoms of nausea and vomiting. Second, the digestive system diseases: due to eating too cold food, spicy and irritating food, unclean diet and other reasons, resulting in the inflammatory reaction of the digestive tract, there is the exudation of inflammatory secretions, which leads to nausea, vomiting, even accompanied by abdominal pain, diarrhea symptoms.